Bone marrow chimeras represent a key tool employed to understand biological contributions stemming from the hematopoietic versus the stromal compartment. In most institutions, cesium irradiators are used to lethally irradiate recipient animals prior to the injection of donor bone marrow. Cesium irradiators, however, have significant liabilities-including concerns around domestic security. Recently, X-ray irradiators have been implemented as a potential alternative to cesium sources.
Only a small number of publications in the literature have attempted to compare these two modalities and, in most cases, the emphasis was on irradiation of human blood productions. We were able to find only a single study that directly compared X-ray and cesium technologies in the generation of murine bone marrow chimeras, a standard laboratory practice. This study focused on chimerism in the blood of recipient animals.
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